Display Panel GOA Shielding Layer for Threshold Stability
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Solution Overview
Problem
The substrate below thin film transistors in Gate Driver On Array (GOA) circuits generates charges under voltage induction, causing a back gate effect that affects the threshold voltage of thin film transistors, leading to instability in the GOA circuit and impacting the display effect of the display device.
Innovation Solution
A shielding layer with variable voltage is introduced between the driving function transistor and the substrate, featuring a first shielding portion with opposite polarity when the transistor is on and the same polarity when it is off, to shield charge interference and enhance transistor stability, thereby improving the driving current and signal transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If GOA circuit technique is used to manufacture driving circuits on array substrate, then manufacturing cost is reduced and productivity is improved, but the substrate generates charges under voltage induction causing back gate effect that destabilizes thin film transistor threshold voltage
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the substrate and the thin film transistor. This shielding layer includes a first shielding portion positioned between the substrate and the driving function transistor, and a second shielding portion positioned between the substrate and the display function transistor. The shielding layer blocks the harmful electric field from the substrate, preventing charge induction and back gate effect while allowing the GOA circuit structure to remain intact for cost-effective manufacturing
2Reliability
If shielding layer is added between driving function transistor and substrate, then threshold voltage stability is improved, but device structure becomes more complex
Solution Approach 1:
The shielding layer is not uniformly applied across the entire substrate but is selectively positioned only in critical areas where the back gate effect impacts transistor performance. The first shielding portion is placed between the substrate and the driving function transistor in the scan driving circuit sub-area, and the second shielding portion is placed between the substrate and the display function transistor in the display area. This localized approach provides necessary protection while minimizing additional structural complexity
3Power
If variable voltage is applied to first shielding portion, then driving current of driving function transistor is increased, but energy consumption increases
Solution Approach 1:
The voltage applied to the first shielding portion is made variable rather than fixed, allowing it to be dynamically adjusted based on operational requirements. When the driving function transistor needs enhanced performance, the voltage can be optimized to increase driving current. When performance requirements are lower, the voltage can be reduced to minimize energy consumption. This dynamic adjustment capability allows the system to optimize the trade-off between power and energy consumption
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The shielding layer effectively stabilizes the driving function transistor, enhancing the output voltage stability and display effect by shielding charge interference, thus improving the overall performance of the display panel.
Implementation Method 1
a shielding layer disposed on the substrate... the first shielding portion is configured to be supplied with a voltage that is variable... effectively stabilizes the driving function transistor, enhancing the output voltage stability and display effect by shielding charge interference
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a substrate; a shielding layer disposed on the substrate; and a driving circuit layer disposed on a side of the shielding layer away from the substrate. The driving circuit layer includes a driving function transistor in the scan driving circuit sub-area. The shielding layer includes a first shielding portion between the driving function transistor and the substrate, and the first shielding portion is configured to be supplied with a variable voltage.